=+6. Calcium phosphate cement is gaining increasing attention for use in bone repair applications. The article “Short-Fibre Reinforcement of Calcium Phosphate Bone Cement” (J. of Engr. in Med., 2007: 203–211) reported on a study in which polypropylene fibers were used in an attempt to improve fracture behavior. The following data on x 5 fiber weight (%) and y 5 compressive strength

(MPa) was provided by the article’s authors.

x: 0.00 0.00 0.00 0.00 0.00 1.25 y: 9.94 11.67 11.00 13.44 9.20 9.92 x: 1.25 1.25 1.25 2.50 2.50 2.50 y: 9.79 10.99 11.32 12.29 8.69 9.91 x: 2.50 2.50 5.00 5.00 5.00 5.00 y: 10.45 10.25 7.89 7.61 8.07 9.04 x: 7.50 7.50 7.50 7.50 10.00 10.00 y: 6.63 6.43 7.03 7.63 7.35 6.94 x: 10.00 10.00 y: 7.02 7.67